How a bout the O.E.M: your local Nissan Dealer. Tell them you are part of a local Z-Car club, and they most likely will give you a 10% discount on the price anyway.
Failing that, Courtesy Nissan's website brokers OE parts all over as does Motorsport Auto.
Victoria British also sells the hoses, but in some cases, I've gotten generic equivalent hoses, and not the nice Nissan Molded parts, sooooo Caveat Emptor...
I am not sure what you need. All of the vac. and fuel lines can be replaced from the std. issue stuff in any good aftermarket store. Try a truck parts outlet. The large vac. lines can be made up from 1/2 in. gas line and if there are 90 degr. bends, you can use a barbed brass elbow w/clamps. You need not use heater hose because it is too stiff to bend.